Delta Home Additions & ADU Nationwide

Delta Home Additions & ADU: The San Antonio Owner’s Guide

If you’re planning a home addition or ADU in San Antonio and want Delta fixtures and finishes throughout the new space, a full-scale project typically runs $45,000 – $130,000 for a home addition, or $90,000 – $220,000 for a detached ADU. We’re Sawyer Remodel San Antonio, a general contractor that builds additions and ADUs with Delta plumbing fixtures, faucets, shower systems, and hardware sourced to match your existing Delta setup or specified fresh for the new build. Most owners call us after discovering that adding square footage means rethinking their entire Delta water delivery system: supply lines, valve bodies, shower trims, and drain assemblies all need to be spec’d correctly before the first wall goes up. Get the Delta details wrong at rough-in, and you’re tearing out tile later.

Call (432) 547-6806

Key Takeaways:

• Home additions run $45,000 – $130,000; ADUs run $90,000 – $220,000 in San Antonio, depending on size, foundation, and finish level.
• Delta fixtures inside a new addition or ADU need to be selected before rough-in, not after drywall goes up.
• We’re an independent San Antonio general contractor, not a Delta dealer or affiliate. We buy Delta products through supply channels and install them to manufacturer spec.
• Every project gets a written price before work starts, a 365-Day Done Right Promise, and The Relay Visibility Guarantee: live arrival times, photo updates, and a price that doesn’t move at the door.

Signs Your Delta Home Additions & ADU Is Failing

An addition or ADU doesn’t “fail” the way a single part does, but the Delta components inside it can. Here’s what we see across San Antonio:

• Low water pressure in the new shower while the rest of the addition runs fine. This usually means the Delta pressure-balance cartridge is clogged with sediment or the integral stops on the rough-in valve weren’t opened fully during install. San Antonio’s hard water accelerates sediment buildup in Delta cartridges faster than most other Texas metros.
• Water temperature swings when someone flushes a toilet in the addition. The Delta pressure-balance spool inside the cartridge is sticking. In a new build this is uncommon, but it happens when debris gets into the line during rough-in and was never flushed out.
• A slow drip from the new Delta tub spout or showerhead after the water is off. This is almost always a worn cartridge seal or a piece of debris caught in the cartridge inlet. On a brand-new install, it’s usually debris from the supply line.
• Leaks at the base of the Delta valve trim or from behind the wall. The rough-in valve wasn’t set at the correct depth for the finished wall thickness, or the valve body wasn’t secured square to the framing. We see this on additions where the wall was furred out after rough-in and nobody re-checked valve depth.
• Water hammer or banging when the Delta shower shuts off. The valve’s integral stops may be partially closed, or the addition doesn’t have proper water hammer arrestors on the Delta supply lines. San Antonio homes on slab foundations feel this more because the pipes are in the concrete, so the bang travels.

Replacement Cost & What’s Included

If you’re reading this because a Delta component inside an existing San Antonio addition or ADU has failed, a Delta valve replacement with a new OEM cartridge and trim typically runs $600 – $2,500 installed depending on whether we’re opening the wall or the valve has accessible stops. A full home addition in San Antonio runs $45,000 – $130,000, and a new ADU runs $90,000 – $220,000, with Delta rough-in and trim plumbing bundled into that scope. What drives the range: square footage, slab versus pier-and-beam foundation work, whether the ADU gets its own water heater and panel, and the finish level of your Delta trim selections. Every line-item is written out before we start, so the number you approve is the number on the invoice. Every repair and every build carries our 365-Day Done Right Promise: if it’s not done right, we make it right, in writing.

DIY or Call Us?

If you’re troubleshooting a Delta cartridge in an accessible shower valve with integral stops, you can shut off the water to that fixture, remove the trim, and check for debris in the cartridge inlet screens. That’s a reasonable Saturday morning job. What you should not do is open a wall to replace a rough-in valve yourself. Once that valve body is exposed, you’re dealing with supply lines under pressure, sweating copper or crimping PEX, and setting a valve to the correct depth so the trim seats flush. Get the depth wrong and water finds its way into the wall cavity, where you won’t see it until the drywall gets soft. Luca Romano grew up in East Los Angeles and learned the trade at LATTC before spending decades on real jobs across the Southwest. He still walks every San Antonio job himself before we wrap. If the Delta part you need is behind a wall or under a slab, call (432) 547-6806 and let us deal with it. The craft comes first. Everything else follows.